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To calculate the number of watts or BTUs needed for a room;
Find the volume of the room by multiplying the width x length x height in metres. For lounges and dining rooms multiply by 50. For bedrooms multiply by 40. For halls and kitchens multiply by 30. For bathrooms multiply by 90.
For rooms facing North add 15%. For French windows add 20%. For double glazing deduct 10%. For a very cold climate such as windy high altitude locations, add 10%.
This will give you the heating requirement in Watts. To convert to BTU multiply the Watts figure by 3.41.
For guidance on installing your Castrads cast iron radiator please download the Help Sheet
The figures quoted here are given in good faith and are true to the best of Castrads' knowledge. Actual heat requirements for a given room can vary. The heat output of a radiator can also vary according to the paint finish and draftiness of the room.
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